The idiot brain

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Across
  1. 4. To be or not to be
  2. 6. Relevant
  3. 8. Reptillia
  4. 9. reactions
Down
  1. 1. keeping something
  2. 2. physic & logic
  3. 3. oppossite efficient
  4. 5. being able to move your body into hard positions
  5. 7. high order brain functions